All,
I am still getting a "puffing" noise from my BN4/6 after I have driven it a
little. After warming it up, I take it up on the freeway a mile or two, turn
around and bring it home. After that, every fourth or fifth sound out of the
tail pipe is a "puffing" sound. Interestingly, the idle is still smooth (no
obvious missing). The only way you can tell there is a problem is listening to
the tail pipe. BTW - when idling and warming up in the garage there is a
steady staccato sound from the tail pipe.
I'm rather puzzled. I replaced the plugs/cap/rotor/wires and set the timing
around 15 BTDC. I looked under the hood at night (in the dark) to see if
there was any shorting and didn't see anything. There doesn't seem to be the
same
problem with the rotor rubbing on the cap that I had before. By the way, I
have electronic ignition.
I'm wondering if it could be something like a bad coil or something that
fails once it has warmed up.
Thank you all,
Phil
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